import java.util.Scanner;

/**
 *  @Author: Chris M.
 *  @Date:   5/31/2017
 */

class Circle {
    static Scanner console = new Scanner(System.in);

    public static void main(String[] args) {
        int n , x , y , r;
        int a , b;
        int counter = 0;

        n = console.nextInt();
        x = console.nextInt();
        y = console.nextInt();
        r = console.nextInt();

        for(int i=0;i<n;i++){
            a = console.nextInt();
            b = console.nextInt();

            if(distance(a , b , x , y) <= r){
                counter++;
            }
        }
        System.out.println(counter);
    }

    public static int distance(int a, int b, int x, int y) {
        return (int) ((int) Math.sqrt(a - x) + Math.sqrt(b - y) * Math.sqrt(b - y));
    }
}